add purchase resource in model catalog

models/resources/data.go

@@ -161,15 +161,12 @@ func (r *PricedDataResource) GetPrice() (float64, error) {
 		r.UsageEnd = &add
 	}
 	if r.SelectedPricing == nil {
-		return 0, errors.New("selected pricing must be set")
-	}
-	pricing := *r.SelectedPricing
-	if pricing == nil {
 		if len(r.PricingProfiles) == 0 {
 			return 0, errors.New("pricing profile must be set")
 		}
-		pricing = r.PricingProfiles[0]
+		*r.SelectedPricing = r.PricingProfiles[0]
 	}
+	pricing := *r.SelectedPricing
 	var err error
 	amountOfData := float64(1)
 	if pricing.GetOverrideStrategyValue() >= 0 {